Breaking Up An Arc

[paul_a_cardinale]

My little CNC machine gags when I try to cut an arc > 180 degrees.  I want to cut a CW arc that's nearly a full circle; so I have to break it up into smaller arcs.  I use an increment of 120 degrees.

The attached VI works fine, but I wonder if there's a cleaner way.

[altenbach]

t are typical default values? With the current settings, we only get four points, forming a triangle, not an arc. I assume the machine has an arc command and these are the starting points?

I have the feeling that things could be simplified, but I am heading for the airport. Maybe I have WIFI in the terminal.... 😄

[paul_a_cardinale]

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@altenbach wrote:

t are typical default values?

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Yes.

With the current settings, we only get four points, forming a triangle, not an arc. I assume the machine has an arc command and these are the starting points?

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Yes (except the last one is the end point).

[paul_a_cardinale]

In the original, I forgot to add back the offset for the center (I didn't notice at first because I was using (0,0) as the center).  Here is the fixed version.

[paul_a_cardinale]

Here is my latest version (can't attach .vi because the file attacher is broken again).

[altenbach]

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@paul_a_cardinale wrote:

In the original, I forgot to add back the offset for the center (I didn't notice at first because I was using (0,0) as the center).  Here is the fixed version.

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Granted, I don't know what commands your CNC wants, but I was really wondering why you did not shift based on the center.

Here's a quick idea, but please verify. There are two possible paths going from start to end (CCW, CW). Can we assume that is defined somewhere?